It's a story about time travel, but the heroine has lost her memory and doesn't know that she has traveled through ancient times and thinks that she is the person in the story. In fact, both men and women have crossed over. The heroine is the eldest lady in the general's palace, and the hero is an invulnerable assassin (actually he has another identity. The two help each other and eventually develop feelings for each other.
Purpose: I hope everyone can be their own light